The correct answer for why Rift Valley is formed is option 2: between two faults. A Rift Valley is a long, narrow region of land that is sinking between two parallel faults. Faults are fractures in the Earth`s crust where the rocks on either side have moved relative to each other. In the case of a Rift Valley, the movement of the crust along the faults causes the land to sink, creating a valley. The African Rift Valley is a prominent example of this geological phenomenon. It is a series of interconnected rifts that extend for thousands of kilometers. This process is associated with tectonic plate movements and the gradual stretching and thinning of the Earth`s crust.